Means for forming tooth-crowns.



Patented Dec. 15, 1914.

17 28 INVENI'UH 0W .arranms :r:

F. 0. JA UES, JR. MEANS FOR FORMING TOOTH OROWNS. APPLICATION FILED MAR.24. 1913.

THE MORRIS PETERS m. PHom-LIYMQ, WASHING N D. c

i UNITE rnnNANDo osonn Jeanne, an, on CRANSTQN,RHQDEKSLAND,.ASSIGNOB onONE- HALF '10 LOUIS snnLDoN MOULTHRQP, or PROVIDENCE, nnoDn ISLAND.

To all-whomit may concern I Be it known that I, FERNANDO OSCAR Ja UEs,J12, a citizen of the United States,

residing at Cranston,-in the county of Providenceand State 'o llihodeIsland, have invented anew and useful Improvement in Means for FormingToothrCrowns, of which the following 18 a speclfication.

My invention has reference to an inn provement in the art of dentistryand more particularly to an improvement in means for forming seamlesstooth crowns of gold or other metals.

" In theuse of the dental system which includes steeltooth forms asshown in the United States PatentNo. 971,274:,"issued to me Sept. 27,1910, the'gold shell is placed on.

the steel tooth form and compressed on to the form by driving theformand shell lengthwise into a block of wood. It has been found thatconsiderable skill, and practice is required to form a perfect toothcrown by this method, particularly so in forminggold crowns for incisorteeth having a sharp cutting edge or end and for canine teeth having-v apointed end. In forming gold tooth crownsffor these teeth, the cuttingedge of the incisor and thepointed end of the canine steel, tooth formsare liable to and are at times driven through the gold shell, therebydestroying the shell, and this may occur in the hands of a skilled,operator; also with this -means it is impossible to obtain the naturalsharp cutting edge of ,an incisor tooth or the natural pointed end of acanine tooth. If the thickness of the cutting edge of an incisor steeltooth former is one thirtysecond of an inch, thls thickness is increasedforming the gold shell.

proportionally by the thickness oi the metal the constructlon and-method of forming seamless tooth crowns of gold or other metals,whereby the above objectionable fea tures are eliminated and moreperfect tooth- -crowns obtained. I

Another object of my invention is topro vide means for forming toothvcrowns so constructed that the said means willoperate simultaneously one the entire: outside and inside of a shell, to form the requiredperfect tooth crown.

Further objects of my invention are-Ito eliminate so far as possibleskilled labor,

Specification of IiettersiPatent. P t t 15,-1 14 Application filed March24, 19 13." serialize. 756,462. I

. time andexpense heretofore required in I forming tooth crowns.

My invention COIlSlStSlIltllG peculiar and tooth crown forming member.Fig. 2 is an underside face view of the upper tooth crown formingmember. 7 3 is a face view-of a thin washer adapted to be interposedbetween thetooth fs crown forming members tovary the size of the crown.Fig.

4c is a transverse verticalsectional view taken centrally; throughthe'tooth crown forming .memberswith the same in the open position. Fig.,5 15a ,longitudinal' rvertical sectional view through the yto oth crownforming members and showin'qflar goldshell loaded with a fusible alloyin position to be opershowing the tooth "crown forming members in theclosed position {and theoperation of forming the toothcrown completed.ElgS.

,7 and 8 are front and side views respectively of the loaded tooth crownremoved from I the crownforming members and showing I the form the-fusible allow has assumed. Figs. 9-and 10 are front and sideviewsrecrown forming member, :13 an upper tooth crown formin'gmember, 14caawasher, 15 a- ;gold shell, 1 6fa fusible metal alloy, and 17 acompletedgold tooth crown. ;.The -lower tooth crown forming member-12 is"preferably in the form of a hardened-steelblock e ated upon by the}crown forming members. v I Fig. 61s a sec't on'alviewsimilar toF 1g.z5,

having a smooth fiat upper surface 18, in

which is a central cavity 19 the bottom and sides rot-which has theform.of approximately one half of the tooth to be crowned,

aiiduct 20 of a'predetermined size leading outwardfrom the cavity 19, ashell gage 21 consisting of a circular: hole having the size of therequired shell and opening downward from the surfac'elS into a recess22in the side ofthe member, a verticalv shell load- .ing9avity23 ha i gt iz 9 is now filled with a fusible metal 'alloyjlfi now removed fromthe tooth crown formin 7 members by inserting a small rodinto the,"

the required shell and approximately one third deeper than the length ofthe shell and a hole 24 extending downward from the bottom of the shellloadingcavity through the member, to facilitate the removal of theloaded shell. The upper tooth crown forming member 13 is preferably ofhardened steel and has a smooth flat under surface on which is a raisedtooth shaped portion 26 the sides and face of which has the form of theother half of the tooth to be crownedand fits tightly into the cavity 19in the lower member 12, assliown in Fig. 6. The washer lat has a centralopening 27 for. the raised tooth shaped portion 26 on the upper member13. These washers are very thin and one or more of them'may beinterposedbetween the tooth crown forming members 12 and 13 to'vary the size ofthe crown, when required. 7

In the operation of my improved means for formingiseamless tooth crowns,a gold shell 15 is gagedrfor size by'passingthe shell through the gage21 into the recess 22. The shell 15 is thenre'moved fromthe recess 22and placed in'the shell loading cavity 23. The shell and upper endofthec'avity V flush with the surface 18 of the-member 12," therebyadding to the shell an excess of into the hole 2& and the loaded shellpushed out of the shell loading cavity 23,, The, shell 15 now loadedwithfthe' -iiusible alloy l6whichextends outward from the shellapproximately one third-the length of. the shell. TheIloaded shell isnow placed in the tooth shaped cavity '19 in the lower tooth crownforming member '18, with the protruding end of the alloy 16' adjacentthe duct' 20, as shown in Fig. 5. The tooth crown forming members 12 and13 -are now forced together, forming a tooth shaped cavity 28 betweenthe members and by an equal pressure ofthe fusible alloy on the entireinside or" theishelljand an equal pressure of the forming members on theentire outside of the shell, the shell is formed into the required toothcrown. The size of the duct'24: is such that a forceslightlyin excess ofthat required to form the shell into a tooth crown is necessarytofforce' thejfusible alloy into: the duct. Th'e'loaded gold toothcrown, as shown in Figs. 7 and: 8 is duct 20, and thefusible alloy 16melted out of the crown, thereby forming a gold tooth crown having theexact size and form ofithe tooth to be crowned. If an incisor tooth isto be crowned the gold tooth crown will have the required sharp'cuttingedge of the natural tooth and ifa canine tooth is to be crowned the goldtooth crown will have the required pointed "endiof. the natural tooth. I

By reversing the position of the tooth shaped cavity 28 as shown in Fig.11 the exact-form of the cusps of a natural bicuspid'or molar tooth maybe obtained. The tooth crown. forming means are supplied in sets, onecomplete tooth crown forming means for each kind and size of tooth to becrowned.

Having thus described my invention claim as new a 1.' Means for formingtooth crowns, co1nprising two members, means formed integ'ral with eachmember and so constructed thatwhen the members are together in theiroperative position a tooth shaped cavity is formed between the members,a duct leading outward from the tooth shaped cavity through one of themembers, and a ductile metal member in the tooth shaped cavity for thepurpose as described. 2. Means forlforming tooth crowns, comprising, twomembers so constructed that when together in their operative positions atooth shaped cavity is formed between the length approximately onethirdlonger than the completed crown,-'and ajduct leading :oirtward'from the tooth shaped cavity through one of the members and a ductilemetal member in the tooth'shaped cavity.

fusible alloy. A small rod is now inserted I 3. Means for forming-toothcrowns, comprising a member having a cavity the form of wh ch sapproximately one half of the tooth to be crowned, a member having araised portion which fits into the cavityand has the form'ofthe otherhalf of thetooth to be crowned, whereby when the'members are together intheir operative positions, a

whole tooth shaped cavity is formed between the members, a duct leadingoutward from the tooth shaped cavity through one of the members and aductile metal member in the tooth shaped cavity.

l. Means for formingtooth crowns, comprising a block shaped memberpreferably 'ofhardened steel and having a central cavityin its upperface, the bottom and sides of said cavity having the form ofapproximately one half of thetooth to be crowned, 'an upper memberpreferably of hardened steel and having a raised portion on its underface, said raised portion fitting into the tooth shaped cavity andhaving the form of the other half of the tooth to be crowned, whereg bywhen the lower and upper members are together intheir operativeposition, a whole tooth shaped cavity is formed between the .members,aduct leading outward from the tooth shaped cavity through the lowermember,'and a ductilemetal member in thetooth shaped cavity, a recess inthe side of the lower member.

V 5. Means for forming tooth crowns, comprising a member having a cavitythe form ofwh-ichis approximately one half of the I erative positions, awhole tooth shaped cavity is formed between the members, a duct leadingoutward from the tooth shaped. cavity through one of the members, and asoft compressible metal member in the shell,

whereby when the members are forced together into their operativepositions a tooth V crown is formed between the walls of the toothshaped cavity and the soft compressible metal and the excess of softcompressible metal is forced into the duct.

6. Means for forming tooth crowns, comprising two members so constructedthat when together in their operative positions a tooth shaped cavity isformed between the members, said tooth shaped cavity having a lengthapproximately one third longer than the completed tooth crown, a ductleading outward from the tooth shaped cavity through one of the'members,a soft compressible and fusible metal member in the cavity, whereby whenthe members are forced together into their operative positions atoothcrown is formed between the walls ofthe tooth shaped cavity and the softcompressible and fusible metal member and the excess of softcompressible and fusible metal is forced into the duct. In testimonywhereof, I have signed my name to this specificationin the presence oftwo subscribing witnesses;

' FERNANDO OSCAR JAQUES, JR.

Witnesses: v

LOUIS S. MoUL'rHRor, CHAS. H. LUTHER.

copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

j Washington, 30.0. i g a

